As a pivotal role in the modern multimedia industry, video occupies most of the communication bandwidth. To alleviate transmission burden and save storage resources, the video content is typically compressed into a compact representation (i.e., bitstream), during the transmission procedure. Once the raw video content information needs displaying for human eyes or employing for multimedia analysis applications, a reverse decoding operation will be applied to recover such compact representations to the raw pixel deployment. In specific, the traditional hybrid video coding (HVC) frameworks [1]} have evolved over the decades with gradually integrating the efficient transformation, quantization, and entropy coding
into the compression procedure, achieving a trade-off on the rate-distortion optimization [2]}. Particularly, the mainstream traditional video coding frameworks, e.g., MPEG-4 AVC/H.264 [3]}, [4]}, High
Efficiency Video Coding (HEVC) [5]}, [6]}, [7]}, [8]} and the recently-proposed versatile video coding (VVC) [2]}, have achieved great success. They all try to promise less distortion between the raw
image and reconstructed image with lower bit-rate cost.
